Considered a basic unit of time as defined by the earth's motion. It represents the time needed for one complete revolution of the earth about its own axis. Also know as a sidereal day, it is approximately equal to 23 hours, 56 minutes, and 4.09 seconds. See night.
DAY
Meaning of DAY in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012